Electric indicator for typewriters



May 25, 1943.

G A. WALKER 2,320,110 ELECTRIC INDIGATDR FOR TYPEWRITERS Filed April 29, 1941 2 Shets-Sheet 1 Inventor Almrney y 1943- G. A; WALKER 2,320,110

ELECTRIC INDICATOR FOR TYPEWRIT ERS Filed April 29, 1941 I 2 Sheets-Sheet 2 Attorney Patented May25, 1943* UNITED STATES PATENT OFFICE ELECTRIC INDICATOR FOR TYPEWRITERS a George Walker, Brunswick, Mo.

Application April 29, 1941, Serial No. 390,988

1 Claim. a (Cl. 197-187) This invention relates to new and useful im provements in indicators and more particularly to a visible indicator for typewriters adapted to indicate the approach of a lineend while typing.

The principal object of the present invention is to provide an electric indicator which will automatically indicate to the' typist of the end of a. line.

Another important object of the-invention is to provide a typewriter vline end visual indicator including switch means operated by. the usual bell clapper or substitute therefor.

Other objects and advantages of the inven# 'tion will-becomeapparent-to the'rea der ofthe following specification. I

In the drawings:

lug It at the upper end of the bracket i4. A

' frame attaching foot 20 is providedat the lower the approach bell l2.

indicating is a" lamp '24.

side connected to a switch generally referred to by end of the bracket 14. An apertured ear -2l is provided on the upper portion of the clapper l3 and another apertured ear 22 isprovided on the lower portion of the bracket l4 and between these cars is-disposed a tension spring 23 serving to hold the clapper In carrying out the present invention, an electrical indicator is employed and the element for This lamp 24 has one numeral 25 while its otherside is connected to Figure 1 represents a fragmentary skeleton" view showing theirelatlonship of the typewriter carriage with respect to the signal switch means,

' and showing the electrical means in'wird rela-.

tion.

Figure 2 is a sectional ,view on the line 2-2 of Figure 1.

Figur 3 is an elevational view of the switch operating clapper.

Figure 4 is a perspective view of theclapper bracket.

Figur 5 is a fragmentary .detailed and d agrammatic view showing a modified ,form of clapper construction.

one siderof a.source of'current 26. The other side or the source of current is connected by a Jumper?! to the bracket l4. The bracket "and clapper I3 are of current: conductivematerial, the

clapper It being swung by the action of the dog I f riding over the protruding finger 18. In other words, as the dog ll moves to the left in Figure 1, it gradually swings theclapper I3 as it rides 28 is provided with a spring contact finger 28 having one end mounted as at 29 and this spring Figure 6 is a top plan view of athird form of the invention.

Figm'e8 is a section taken substantially on the line 8-8 of Figure '7. Referring to the drawings wherein like numerals designate like partait can be seen that numeral 5 generally refersto the carriage of av Figure '7 is asection on the line'l-H oi Figure The usual signal means consists of a hell I! suitably mounted on the frame 8 and a rockable clapper l3 mounted on'a bracket I4. As is shown a in Figure 4, it is preferable that the bracket ll be of substantially L-shape having an openingl5 at its heel portion to receive a pivoting member 15 which extends through-a transverse slotv II in the upper portion of the clapper I! has finger l8 extending upwardly to engage asto;

against the finger l8 and as it rides over the finger l8 in the conventional way, it releases the clapper l3 and it strikes the bell l2. However, in carrying out the presentinvention the switch finger is located within the path of the clapper head. "An adjusting screw 30 is provided on a base 3] which also carries the spring -contact finger 28 and this screw is adapted for adjusting the spring finger 28 with respect to the clapper l3. .Due to the presence of the slot l1 in the switch operating clapper l3. after the clapper head engages the spring finger 28 to complete the circuit including the indicating lamp 24, the carriage can move a substantial distance with the dog ll riding against the finger l8 because rather than permit releasement ofthe dog II from the finger IS the entire clapper I! will slide at the slot I! on thepivot member l6 aflord I lamp 24.

' Of course, the current passes from the batconstruction as the switch 25. r The bracket l4a is of the same constructionfas the bracket l4,

but the clapper I3 is constructed somewhat dif .ferently. In this form of the invention, t e clapper l3-need not have the slot I'I, but is pivotl3' with its head toward the ing a duration to the illuminating time of the ally mounted on a pivot member "a. The'clapper l3a has an upstanding finger lla' terminating in an oblique toe member 33 against which the dog Ila can ride. Obviously, as long as the dog Ha rides against the oblique toe member 33 the clapper head will be in operated position against the switch 2,511 for maintaining the lamp 24a energized.

A third form of the invention is shown in Figures 6, 7 and 8, and in this form of the invention,

the usual gauge strip 34 which is of metal is insulated by a strip of'insulation 35 from the front cross bar 36 of the frame in,

Numeral 5a denotesv the typewriter carriage including a roll la and a longitudinal rod 8a which carries a line end signal determining element 31. This element 31 has a depending camlike formation 38. Numerals 39 and 40 represent line end determining pointers, the pointer 39 being held on a rod 4! spanning the frame to by collars 42, 43, while the pointer 40 is mounted on a set screw secured sleeve 44 slidable on the rod 4|. The pointer 40 overlaps the gauge strip 34 and is rockably supported as at 45 on the sleeve 44, a spring at the pivot point 45 serving to norinally hold the pointer 40 in the spaced relation shown in Figure 7 with respect to the gauge strip 34.

Q Obviously, as the carriage 5a moves to the left,

the cam 34 will ride a backwardly disposed tail portion 46 of the pointer 40, swinging the pointer 40 so as to contact the same against the contact gauge strip 34. signal lamp 24b which is incircuit with a source of current 2817, the contact gauge strip34, rod 4| and pointer 40.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:

In combination with a typewriter having a' carriage and a frame, a linejfehd indicating de- This results in energization of, a 

